Great video thanks for sharing. The Bryans might have gotten it from the Red Hit Chili Peppers Higher Ground video, which is from the late 80s. Or the Peppers got it from the Bryans. It's one or the other.

Cool to hear that Venus initiated the chest thump at Wimbledon ) Never would have thought that as V is usually all business out there.

The origin of the chest bump goes back to the deepest recesses of the Congo. Mountain gorillas, specifically silver back males born from the same female were known to greet each other in such a manner.